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3 years ago

PLEASE HELP ASAP

Chemistry

1 answer:

Kisachek [45]3 years ago

6 0

Answer:

opg

Explanation:

A series of chemical reactions transform Volatile Organic Compounds (VOCs) into substances that combine with nitrogen dioxide to produce PAN (Peroxyacytyl nitrate), yet another element in smog. Nitrogen dioxide in the air also reacts with water vapor to form nitric acid, one of the types of acid in acid rain.

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Copper crystallizes in a face-centered cubic unit cell. the density of copper is 8.94 g/cm3. calculate the length of the edge of

Ilia_Sergeevich [38]

361.4 pm is the length of the edge of the unit cell. First, let's calculate the average volume each atom is taking. Start with calculating how many moles of copper we have in a cubic centimeter by looking up the atomic weight. Atomic weight copper = 63.546 Now divide the mass by the atomic weight, getting 8.94 g / 63.546 g/mol = 0.140685488 mol And multiply by Avogadro's number to get the number of atoms: 0.140685488 * 6.022140857x10^23 = 8.472278233x10^22 Now examine the face-centered cubic unit cell to see how many atoms worth of space it consumes. There is 1 atom at each of the 8 corners and each of those atoms is shared between 8 unit cells for for a space consumption of 8/8 = 1 atom. And there are 6 faces, each with an atom in the center, each of which is shared between 2 unit cells for a space consumption of 6/2 = 3 atoms. So each unit cell consumes as much space as 4 atoms. Let's divide the number of atoms in that cubic centimeter by 4 to determine the number of unit cells in that volume. 8.472278233x10^22 / 4 = 2.118069558x10^22 Now calculate the volume each unit cell occupies. 1 cm^3 / 2.118069558x10^22 = 4.721280262x10^-23 cm^3 Let's get the cube root to get the length of an edge. (4.721280262x10^-23 cm^3)^(1/3) = 3.61426x10^-08 cm Now let's convert from cm to pm. 3.61426x10^-08 cm / 100 cm/m * 1x10^12 pm/m = 361.4 pm Doing an independent search for the Crystallographic Features of Copper, I see that the Lattice Parameter for copper at at 293 K is 3.6147 x 10^-10 m which is in very close agreement with the calculated amount above. And since metals expand and contract with heat and cold, I assume the slight difference in values is due to the density figure given being determined at a temperature lower than 293 K.

4 0

3 years ago

Question 20 a raindrop has a mass of 50.mg and the pacific ocean has a mass of ×7.081020kg . use this information to answer the

insens350 [35]

The questions you can answer are

1) what is the mass of one mole of raindrops?, and

2) How many moles of raindrops are in the pacific ocean

Solutions:

1) what is the mass of one mole of raindrops?

mass = number of rain drops * mass of on rain drop

The number of rain drops in one mole of rain drops is 6.02 * 10^23

So, the mass of one mole of rain drops is

6.02 * 10 ^ 23 rain drops * 50. mg * (1 kg / 1,000,000 mg) = 3.01 * 10^ 19 kg

The correct number of significant digits is 2, because 50. mg has two signficant digits, so the answer must be shown as 3.0 * 10^ 19 kg.

2) How many moles of raindrops are in the pacific ocean

Use the proportion 1 mol / 3.0 * 10^19 kg = x mol / 7.08 * 10^20 kg

And you solve for x:

x = (7.08 * 10^20 kg) * 1 mol / (3.0 * 10^19 kg) = 2.36 * 10 = 23.6 moles

Which rounded to two significant digits is 24 moles of rain drops.

8 0

4 years ago

Read 2 more answers

Jonas mixes citric acid with baking soda. How does he know the reaction is endothermic?

Leya [2.2K]

It is endothermic if it absorbs heat. An exothermic reaction releases heat.

5 0

3 years ago

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In the following reaction, Zn is Zn(s) H2SO4(aq) --> ZnSO4(aq) H2(g) A.Reduced B.Oxidized C.This is not a redox reaction D.An

Svetlanka [38]

Answer: The correct option is B) oxidized

Explanation:

Redox reaction is defined as the reaction in which oxidation and reduction take place simultaneously.

The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction. It occurs when the oxidation number of a species increases.

A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction. It occurs when the oxidation number of a species decreases.

For the given chemical reaction:

$Zn+H_2SO_4+S\rightarrow ZnSO_4+H_2$

On the reactant side:

Oxidation number of H = +1

Oxidation number of Zn = 0

Oxidation number of S = +6

Oxidation number of O = -2

On the product side:

Oxidation number of H = 0

Oxidation number of Zn = +2

Oxidation number of S = +6

Oxidation number of O = -2

As the oxidation number of Zn is increasing from 0 to +2. Thus, it is getting oxidized. Similarly, the oxidation number of H is decreasing from +1 to 0. Thus, it is getting reduced.

Hence, the correct option is B) oxidized

4 0

3 years ago

Many theories about atomic structure have molded the current view of the atom. The quantum model suggests that electrons _______

Shkiper50 [21]

Answer:

behave as waves and the probability of finding the electron is determined by the factor, ψ²

Explanation:

Erwin Schrödinger proposed quantum mechanical model of atom in which electron behave as waves. He introduced ψ, which is the amplitude of the wave of the coordinates (x, y ,z ). ψ² represents probability of finding the electron in the given region above within the atom.

The atomic orbital is the region within the atom which encloses where electron is more than 90% probability.

7 0

3 years ago